mershon



(No Model.) 4 I A B. MERSHON.

GRATE.

110.261,375.` Patented J/11/1y18, 1882.

vu. Patins mum;

UNITED STATES PATENT OFFICE.

GEORGE B. MERSHON, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE AMERICAN GRATE BAR COMPANY, OF SAME PLACE.

G RATE.

SPECIFICATION forming part @fretten Patent No. 261,375, dated July 1s, 1882.

Application filed May 22, 1882, (No model.)

To all whom it may concern:

Be it known that I, GEORGE B. MERsHoN, of the city and county of Philadelphia, State of Pennsylvania, have invented certain Improvements in Grates, of which the following is a specilication.

My invention relates to that class of grates in which the bars are supported so as to be rocked to rake the fire; and my improvements 1o consist in constructing and supporting` the bars as fully described hereinafter, so as to secure great strengthQrigidity, and durability Withoutcorresp'ondinglyincreasing the weight, and so as to permit a bed of any desired extent to be readily built up of short bar-sections.

In the drawings, Figure l is a. plan in part section of one of my'improved bars. Fig. 2 is a transverse section enlarged. Fig. 3 is an end view. Fig. 4 is a view of one of the crank-arms. 2o Fig. 5 is a perspective view, showing the manner of building up the grate of short bar-sections; and Fig. 6 represents a connecting-shaft.

The bars are east each in one piece, consisting substantially of three connected sectionsviz., two side Webs or sections, c u, and a central web, b, deeper than the side webs, and united tothe latter at the top by thin necks e, forming two longitudinal grooves at the under side extending nearly to each end. In the 3o necks e are longitudinal slots i, which, with the top of the rib and outer sides of the'side webs, havecurved faces, so that the body of the bar is cylindrical. The teeth or lugs d project from the side pieces, and the ends of the bar are provided with lugs or necks to lit bearings in the frame; or they may have angular sockets to receive the angular ends f ofshafts or studs I), which have suitable bearings tc lit sockets in the frame T, and angular ends g to 4o fit angular openings in detachable pinions or crank-arms E, by means of which the bars may be socketed, as set forth in Letters Patent Nos. 180,616, 193,018, and 213,228, heretofore gran t1 ed to me.

By constructing the bar as above described* that is, with deep narrow' side Webs or sections, a'a, parallel to a central web-I secure great durability and rigidity without proportionate increase in weight, as the sections a a b impart great stiuess to the bar, enable it 5o to support a heavy load without bending, and prevent it from warping, so that the parts may be cast thinner than heretofore. i It vwill be seen that the connection between the side pieces and central web, through the necks e, is very slight, and that the side lugs or teeth, d, are carried mainly by these side pieces, so that the air can pass freely behind such side pieces and up through the slots t', thereby preventing the lugs from becoming so 6o overheatedas to burn away, which is apt to occur when there is no means of keeping their supports from becoming undauly'heated.

Where it is necessary to secure a lire-bed having an extended area, the bars may be 4made with angular or feathered sockets x at their inner ends, adapted to receive corresponding projections, h, upon both ends of short shafts or cylinders F, adapted to sockets or bearings y in cross-bars J, forming part of or extend- 7o ing across the frame. These shafts F serve as a means of connecting the barsections in line with each other, as shown in Fig. 5, and of transmitting motion from one to thc other. It will be apparent that by this means any desired number of bars may be arranged in line to build up grates of `any desired extent, and that this mode of forming the grate or bed may be pursued with grate-bars of different constructions. It will further be evident that 8o projections or lugs on the ends of the bars may fit sockets in the short shafts F. This construction has the advantage over the use of long bars that it maintains a more level bed, not so likely to sink under the load upon it. It 8 5 is also more readily and cheaply repaired.

Without limiting myself to the precise construction and arrangement of parts shown, I claim- 1. A revolving grate-bar consisting of three 9o sections, a a b, arranged vertically and substantially parallel, and connected at their upper parts by perforated necks e, the side sections carryin g lugs d, substantially as set forth.

2. The combination, in a grate-bar, of a central web, b, side webs `or sections, c a, having curved outer faces arranged substantially parallel to said web, and connected thereto at the upper edges Aby perforated necks e, and In testimony whereof Ihave signed myname ro lugs d, projecting from said side sections7 subto this specification in the presence of two substantia-lly as specified. scribing witnesses.

3. The combination, in a grate, of bars ar- 5 ranged in line with each other, and conneot- GEORGE B. MERSHON.

ing shafts F, supported by a cross-piece, J, the bars and shafts havin g corresponding an- Witnesses: guiar lugs and sockets, substantially as set CEAS. W. HILLMAN,

forth. ROBERT TNGRAM. 

